Density

Density

kg/cubic meter, gram/centimeter³,  lbm/cubic inch, lbm  /cubic foot, slug/cubic foot, kilogram/cubic meter, lbm/gallon (US liq)

Density Water

a)      1000 kg/m³ = 62.43 Lbs./Cu.Ft 
                           = 8.33 Lbs./Gal. 
                           = 0.1337 Cu.Ft./Gal.

 
b)       1 lb/ft³ = 16.018 kg/m³ 
                     = 0.016 g/cm³ 
                     = 0.00926 oz/in³ 
                     = 2.57 oz/gal (Imperial)
                     = 2.139 oz/gal (U.S.) 
                     = 0.0005787 lb/in³ 
                     = 27 lb/yd³ 
                     = 0.161 lb/gal (Imperial) 
                     = 0.134 lb/gal (U.S)
                     = 0.0121 ton/yd³
 

c)          1 slug/ft³ = 515.379 kg/m³


 
d)          1 kg/l = 62.43 lb/ft³
 

e)           1 kg/m³ = 0.001 g/cm³ 
                          = 1 g/ml
                          = 0.0005780 oz/in³ 
                          = 0.16036 oz/gal (Imperial) 
                          = 0.1335 oz/gal (U.S.) 
                          = 0.0624 lb/ft³ 
                          = 0.000036127 lb/in³
                                = 1.6856 lb/yd³ 
                          = 0.010022 lb/gal (Imperial) 
                          = 0.008345 lb/gal (U.S)
                          = 0.0007525 ton/yd³

Capacitance, Conductance, Current

Capacitance

a)   1 ab farad = 1x10⁹ farad 
                    = 1x10¹⁵ microfarad
                    = 8.98755x10²⁰ stat farad
 

b)   1 farad = 1x10^-9 ab farad 
                 = 1.00049 farads (Int)
                 = 1x10⁶ microfarad 
                 = 8.98755x10¹¹ stat farad 

 

Conductance

       1 abmho = 1000 megamho  

                    = 1x10⁹ mho

                    = 8.98755x10²⁰ statmho

 

Current

a)      1 ab ampere = 10 ampere

                           = 1.03638x10^-4 Faraday/sec(chem) 

                           = 2.99792x10¹⁰ stat ampere 

                           = 1 biot

 

b)       1 ampere = 0.1 ab ampere.

                        = 1.00015 ampere (Int) 

                        = 1 coulomb/sec

                        = 1.03638x10^-5 Faraday/sec (chem) 1x10⁶ micro ampere 

                        = 1000 milli ampere 

                        = 2.99792x10⁹ stat ampere

 

c)          1 ampere (Int) = 0.99985 ampere

 

d)          1 biot = 10 ampere

Area

Area

acre, are, barn, sq.ft., sq.in., foot², hectare, inch², mile², section, meter², township, yard², hectares

a)  1 m² = 1550 in² 

             = 10.764 ft² 

             = 1.1968 yd² 

             = 3.861x10^-7 mile²

b)   1 ft² = 0.0929 m² 

             = 144 in² 

             = 0.1111 yd² 

             = 3.587x10^-8 mile²

c)   1 in² = 6.452 cm² 

              = 6.452x10^-4 m² 

              = 6.944x10^-3 ft² 

              = 7.716x10^-4 yd² 

              = 2.491x10^-10 mile²

d)    1 yd² = 0.8361 m² 

                = 1296 in² 

                = 9 ft² 

                = 0.3228x10^-6 mile²

e)    1 mile² = 2.590x10⁶ m² 

                  = 0.4015x10¹⁰ in² 

                  = 2.788x10⁷ ft² 

                  = 3.098x10⁶ yd² 

                  =640 Acres

f)   1 acre = 1/640 square mile 

               = 0.404686 ha (Hectares) 

               = 4046.86 m² 

               = 43560.174 Sq.Ft. (Int)

               = 43560 Sq.Ft. (US Survey) 

               = 4840 Sq.Yds. 

               = 40.46873 are
 

g)   1 km² = 10² ha² 

               = 10⁶ m² 

               = 10¹⁰ cm² 

               = 10¹² mm²

h)   1 ha (Hectare)  = 10⁴ m² 

                            = 10⁸ cm² 

                            = 10¹⁰ mm² 

                            = 2.471 Acres
 

i)      1 cm² = 10^-4 m² 

                 = 0.155 in²

j)      1 mm² = 1.55x10^-3in²

k)     1 township = 36 square mile 

                        = 23040 acre 

                        = 36 section 

                        = 9.323957 10⁷ m² 

                        = 9324 hectare

                        = 93.24 square kilometer

 

l)     1 section = 1 square mile

                     = 2.59 10⁶ m² 

                     = 2.59 square kilometer 

                     = 259 hectare

                     = 3.0976 10⁶ square yards

                     = 640 acre 

 
 

m)    1 are = 0.024711 acre (Int) 

                = 1 sq dekameter 

                = 1076.39 sq foot 

                = 100 sq meter 

                = 3.86102x10^-5 sq mile 

                = 119.599 sq yard
 

n)      1 barn = 1x10^-24 sq cm
 

o)      1 centiare = 0.01 are 

                        = 10.764 sq foot  

                        = 1550 sq inch

                        = 1 sq meter

                        = 1.19599 sq yard

 

p)      1 circular mil = 1x10^-6 circular inch 

                           = 5.06707x10^-6 sq cm

                           = 7.85398x10^-7 sq inch

                           = 0.000507 sq mm

                           = 0.7854 sq mill

q)     1 hectare = 2.471 acre  

                      = 100 are

                      = 1x10⁸ sq cm

                      = 107639.1 sq foot

                      = 10000 sq meter

                      = 0.00386 sq mile

                      = 395.367 sq rod

r)      1 rood = 1/4 acre 

                   = 1011.5 m² 

                   = 40 sq rods 

                   = 40 sq perches
 

s)      1 sq rod = 1 sq perch

                      = 30¼ sq yards 

                      = 25.2928 m²

                           = 1/160 acre
 

t)       1 arpent = about 0.85 acre

                      = 3439.1 m²
 

u)     1 Marla = 30.25 Sq. Yards 

                   = 25.2928 Sq. Metres

                   = 272.25 Sq. Feet 

                   = 0.00625 Acre 

                   = 0.05 Kanal

Angle

Angle

i)   1 circle = 360 degrees 

                = 400 grades 

                = 21600 minutes 

                = 6.28318 radians 

                = 12 signs

ii)  1 circumference = 360 degrees 

                            = 6.28318 radians

iii) 1 radian = 0.15915 circumference 

                 = 57.29578 degree

                 = 3437.747 minute 

                 = 0.63662 quadrant

                 = 0.15915 revolution 

                 = 206265 second

Acceleration

Acceleration

        foot/second², meter/second², gal, galileo, inch/second²

i)  1 m/s² = 3.28084 ft/s²  
               = 100 cm/s²     
               = 39.37 inch per second squared (inch/s²) .

ii)  1 ft/s² = 0.3048 m/s²    
               = 30.48 cm/s²




iii)  1 g      = 9.80665 m/s²  
               = 32.17405 ft/s² 
                   = 386.1 in/s² 
                   = 35 kph/s 
               = 22 mph/s

SI units

Introduction :

The SI system (International System of Units) is the modern metric system of measurement and the dominant system of international commerce and trade. SI units are gradually replacing Imperial and USCS units.

The SI is maintained by the International Bureau of Weights and Measures (BIPM, for Bureau International des Poids et Mesures) in Paris.
The SI system is founded on the

• SI base units
• SI derived units described in terms of acceptable SI units
• SI derived units with special names and symbols acceptable in SI
• SI Prefixes

SI Base Units

The core of the SI system is a short list of base units defined in an absolute way without referring to any other units. The base units are consistent with the part of the metric system called the MKS system. The International System of Units (SI) is founded on seven base units.

 

SI Derived Units with Special Names and Symbols acceptable in SI

Derived units are algebraic combinations of the seven base units and the two supplementary units with some of the combinations being assigned special names and symbols.


 

 

SI Derived Units described in Terms of acceptable SI Units

Derived units are algebraic combinations of the seven base units and the two supplementary units with some of the combinations being assigned special names and symbols.

SI Prefixes

 

 

The prefixes provide an order of magnitude: Ex.

• 16600 m = 16.6 10³ m = 16.6 km
• 1 mm³ = (10^-3 m)³ = 10-9 m³